Characteristics of the Seafloor

Question 1

Which material rises from cracks in oceanic crust?

Revolt · Accepted Answer

molten rock

Question 2

How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading?

Revolt · Accepted Answer

They reveal a matching pattern on either side of the ridge.

Question 3

Which type of material becomes molten rock at subduction zones?

Revolt · Accepted Answer

heavy plates

Question 4

Which evidence originally supported Hess’s idea of seafloor spreading in 1968?

Revolt · Accepted Answer

Younger rocks are closer to mid-ocean ridges.

Question 5

Which statement describes the cyclic nature of seafloor spreading?

Revolt · Accepted Answer

New oceanic crust is created.

Question 6

Which concept is described in the theory proposed by Hess?

Revolt · Accepted Answer

Mid-ocean ridges are sites of seafloor spreading.

Question 7

At the end of seafloor spreading, where does the molten rock solidify?

Revolt · Accepted Answer

center of the ridge

Question 8

According to the theory proposed by Harry Hess, what causes continents to move?

Revolt · Accepted Answer

seafloor spreading

Question 9

How does oceanic crust move along mid-ocean ridges?

Revolt · Accepted Answer

away from the ridge

Characteristics of the Seafloor Answers